CV-18 Fujian/003 CATOBAR carrier thread

[stannislas]

I don't know if this has been answered previously or even known, but what does the Fujian use for energy storage? Flywheels or capacitors?

I've asked that exact question and people suggested capacitor, we probably won't have concrete confirmation (if someone manage to dig up some patents would be great) but I do believe it is in fact capacitor since it seems to be the general direction China is moving to, including railgun development. And there've been no mention or rumors' afaik about flywheels anywhere else, at least back when I can still access Chinese military forums

far as I understand, flywheel need to convert to AC in order to let the motor to rotate, so it doesn't make much sense for their DC system to do...

spent a lot of effort to build a MVDC, then add extra component to convert back to AC? not making any sense to me from an engineer point of view

 

[charles18]

If the CPC believes carriers to be obsolete in 2022, it would not be building one. The fact that 003 exists means the CPC does not believe this to be the case.

Of course China cares about face. So does every other government. But not to the extent that it would waste considerable resources on a 'largely obsolete' asset.

I think it's a little more complicated than that. It is not an all or nothing proposition.
Let us suppose aircraft carriers are capable of performing three different types of jobs: job 1, job 2, job 3.
If a new technology comes along and makes carriers obsolete for "job 1" that doesn't necessarily make carriers completely obsolete because it can still perform other job. However it does change the equation.

"The fact that 003 exists means the CPC" believes carriers still have a role to play. That does Not necessarily mean it will continue to perform "job 1".

 

[davidau]

far as I understand, flywheel need to convert to AC in order to let the motor to rotate, so it doesn't make much sense for their DC system to do...

spent a lot of effort to build a MVDC, then add extra component to convert back to AC? not making any sense to me from an engineer point of view

far as I understand, flywheel need to convert to AC in order to let the motor to rotate, so it doesn't make much sense for their DC system to do...

spent a lot of effort to build a MVDC, then add extra component to convert back to AC? not making any sense to me from an engineer point of view

I beg to differ. The AC system on US carriers have suffered a lot of defects in carrier operations, hence China, under Ma has done numerous calculations [ I forgot where in this forum and Chinese media I read] and came up with DC which is a better soluction. OK time soon enough will tell when 003 start using its CATOBAR.

 

[enroger]

Which is further complicated by the fact the EMALS at least circa 2016 were simply not reliable as they would fail at least once every 400 launches. That's 10 times worse than the required 4,000+ cycles between failure -



As to what the USN has done since then to address all of that, if at all, is sadly but understandably under-publicised. So it'd be really interesting to see what the PLAN has come up with for their EMALS when they finally get around to testing them on the boat.

Nice of the US to be the first to demonstrate...... what doesn't work....very well

Looking at that mess, I can imagine Ma thinking how it is worth it to pay for the extra weight and space even if capacitors has lower energy density

 

[stannislas]

I beg to differ. The AC system on US carriers have suffered a lot of defects in carrier operations, hence China, under Ma has done numerous calculations [ I forgot where in this forum and Chinese media I read] and came up with DC which is a better soluction. OK time soon enough will tell when 003 start using its CATOBAR.

... uhhh, i don't understand the relationship between your answer to my post....

 

[BTKTB]

The US Navy had serious problems to complete launch phases. They had to shut down the whole system to deal with the problems.

CVN-79, CVN-80 and CVN-81 wont have the same problems right? Seems to me that this flywheel-system-energy-distribution issue isn't too hard to tackle or am i wrong? All it takes is just some redesign of how catapults and flywheels are connected so they'll be fine I think?

 

[luosifen]

Recently released video of the towing:

 

[Broccoli]

Thats the other way around ... Extremely high voltage DC like in China is to transport huge electricity from Western to the Eastern, and very long distance

HVDC has much lower losses than HVAC

read this

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.

Maybe somehwere in China but I haven't heard anyone building DC delivery on large scale for civilian applications.

 

[duncanidaho]

Maybe somehwere in China but I haven't heard anyone building DC delivery on large scale for civilian applications.

There are alot of High Voltage Direct Current transmission lines conncting the offshore windfarms in the Northsea with the continent.

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[antiterror13]

Maybe somehwere in China but I haven't heard anyone building DC delivery on large scale for civilian applications.

Something you haven't heard ...doesn't meant doesn't exist ... purely wrong logic

HVDC is everywhere .. in NZ one of the first in the world operated from 1965

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I know the stuff well, thats what I do ... so just accept it and move on